Keep bath toys clean by preventing them from filling up with water in the first place. Water (and soap, and anything else that’s floating around in the tub) fills up toys and can lead to mold. We don’t want our rubber ducky filled with mold!
Here’s what you do: start with a new toy or a clean, dry toy. Get out your crafty hot glue gun. Fill up the hole with enough hot glue to cover the entire hole, and then some. Let it dry overnight and you’ll have a fresh and clean toy that floats and is air tight.
As far as cleaning the outside of the toy, you can use a Dobie sponge to keep it free of soapy stains.